Regulator mouthpiece



FIG. 1 is a perspective view of a regulator mouthpiece showing my new design.

FIG. 2 is an enlarged front elevational view thereof.

FIG. 3 is an enlarged rear elevational view thereof.

FIG. 4 is an enlarged bottom plan view thereof.

FIG. 5 is an enlarged top plan view thereof.

FIG. 6 is an enlarged side elevational view thereof.

FIG. 7 is a front elevational view thereof, showing the regulator mouthpiece used in conjunction with a second stage diver's regulator. The broken lines are not part of the claimed design. 

The ornamental design for a regulator mouthpiece, as shown and described. 